Abstract
Advanced Fiber Information System (AFIS) mean fiber length by weight (Lw), fiber length development period (FLDP), and average daily fiber length growth rates (ADGR) were determined for four experimental strains and three cultivars of upland cotton, Gossypium hirsutum L., in 1998 and 1999 in College Station, TX. TAM 94L‐25 and TAM 94M‐14, near‐long staple sib lines developed by the Texas Agricultural Experiment Station (TAES), were compared with five upland cotton genotypes that varied in high‐volume instrument (HVI) upper half mean (UHM) fiber length. The FLDP was determined as the number of days postanthesis (DPA) until fibers reached a Lw greater than or equal to their Lw at boll opening. Final average daily growth rate (FADGR) was calculated as the average Lw d−1 from anthesis to open boll. Length by weight was determined at 3‐d intervals from 16 DPA until boll opening. With a higher FADGR and longer FLDP, TAM 94L‐25 and TAM 94M‐14 exhibited the longest final Lw TAM 94L‐25 had a higher FADGR than the commercial cultivars Suregrow 125 and Tamcot CAMD‐E, while TAES strain 94WD‐17 exhibited the lowest FADGR. The broad‐sense heritability estimate for final Lw across years was 0.88.
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